I tried using Tesseract around a year ago to recognize digits only, very clean images, not some weird font. I had thousands of images, and it failed in around 3

I tried using Tesseract around a year ago to recognize digits only, very clean images, not some weird font. I had thousands of images, and it failed in around 3% of them. It was so weird, as it would recognize the same digits in other images just fine. I tried 4 or 5 different OCR programs, and none of them worked well enough for my case. I was actually surprised, I thought OCR was a solved problem with ridiculously low error rates.